I don't know about 6/10...I would probably give her more than that. Superman while amped couldn't even touch Diana accept when he surprised her with heat vision. When she wanted to end it, she did. Lasso and tie up for the win and she would do that majority of the time.
Diana's combat skills are nearly next to none in her weight class. Adam is likely more powerful, more durable, and stronger but upsets have happened plenty in comics. That being said, it would be her fight to lose. I'd give her a 65% or better chance of winning here.
There's plenty of evidence. Blue Marvel single took out Pagan all on his own, leaving many people with their mouths open. Pagan beat up on the combined might and power of an extremely powerful team of Avengers which consisted of Thor, Scarlet Witch, Wonder Man, Vision, Firestar, Vance Astro, Triathlon, Captain America, Captain Marvel, and Iron Man. I highly doubt that Wonder Woman would be able to do that.
It actually seems very likely from that feat alone that Pagan was a low to mid trans. Yeah Adam is more very likely more durable, stronger, and more powerful than Diana.
Of course he could. It would have been more impressive if she had done it alone. No telling what percentage she pulled. She'd never defeat the team that Pagan was beating up on, and like I said earlier Adam turned around and kicked Pagan's butt.
I see the fight going a lot like Gamora vs Random powerhouse. She wouldn't sweep, but her level of skill would allow for her to convincingly outscore Adam. No way is she stronger though, and he's proven to be able to hang with guys capable of high speed combat. He just lacks her level of skill.